<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>Example</title>
</head>

<body>
    <script type="text/javascript">
    var firstVal = "5";
    var secondVal = "5";

    var result = Number(firstVal) + Number(secondVal);

    document.writeln("Result: " + result);
    </script>
</body>

</html>
